Modification of metasurface-based CP array antenna by using cascade feed network

• Published in: IET microwaves, antennas & propagation antennas & propagation, 2019-07, Vol.13 (9), p.1334-1337
• Main Authors: Karamzadeh, Saeid, Rafiei, Vahid
• Format: Article
• Language: English
• Subjects: adjacent cells; antenna feeds; antenna radiation patterns; aperture antennas; aperture slot; broadband antennas; broadband feed network; cascade feed network; compact size array; compact size several techniques; destructive effects; electromagnetic wave polarisation; feed lines; frequency 4.22 GHz to 7.0 GHz; metallic ground layer; metasurface cells; metasurface layer; metasurface‐based CP array antenna; metasurface‐based CP patch antennas; microstrip antenna arrays; microstrip line; microstrip lines; middle layer; mutual coupling reducer; radiation layer; Research Article; slot antenna arrays; unique compact size high gain circularly polarised array antenna
• ISSN: 1751-8725; 1751-8733; 1751-8733
• DOI: 10.1049/iet-map.2018.5667

In this work, a unique compact size high gain circularly polarised (CP) array antenna is proposed. The array is considered as a 2 × 2 metasurface-based CP patch antennas which fed by a cascade network. The single element consists of two different layers of substrate that metasurface layer excited by aperture slot on metallic ground layer in middle layer between metasurface cells and microstrip line, meanwhile this layer isolates destructive effects of feed lines on radiation layer. For achieving high gain at a compact size several techniques such as (i) use of broadband feed network, (ii) utilising of adjacent cells with unique structure as mutual coupling reducer, and etc. have been simultaneously applied. In order to validation of simulated parameters the proposed array has been fabricated and measured. The measurement results for the proposed compact size array antenna are the impedance bandwidth (|S11|